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2019 Fiscal Year Final Research Report

Elucidation of submarine sedimentation process and formation process of local high-concentration state for radionuclide released to the ocean

Research Project

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Project/Area Number 16K00580
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Environmental impact assessment
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

Principal Investigator

Mitsufumi ASAMI  国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (80446591)

Co-Investigator(Kenkyū-buntansha) 岡 秀行  国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (80399518)
Project Period (FY) 2016-10-21 – 2020-03-31
Keywords海底堆積物の広域・局所的変動 / 放射性核種海洋移行 / 質量保存流速場モデル
Outline of Final Research Achievements

The Fukushima Dai-ichi Nuclear Power Plant accident in 2011 resulted in the release of enormous quantities of radionuclides, especially radioactive cesium, into the ocean. The radionuclides which have accumulated in sea sediment have been formed vertical concentration distribution in seabed sediment. In the present study, movements of suspended particle material and radionuclides transport on the Fukushima coastal area was evaluated for understanding distribution patterns of radionuclides in seabed sediment. Furthermore, a radionuclides dispersion model was constructed to reproduce the concentration distribution of radionuclides inside the sediment.

Free Research Field

放射性物質大気海洋拡散, 放射線遮蔽工学

Academic Significance and Societal Importance of the Research Achievements

放射性核種の海底堆積物に沈着した濃度分布を形成する主要因が明らかになることで、放射性核種吸着後の海底堆積物の濃度の経時変化が把握できるようになる。その結果、従来大規模かつコストのかかる海域モニタリングが実施されていたが、本研究で開発した手法を利用することにより、放射性核種放出によってもたらされる漁業等に与える環境影響を評価するために有益な情報を提供することが容易になる。

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Published: 2021-02-19  

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